The binding sites of Iron atom in the structure of Oxy Structure of HIS100TRP Cerebratulus Lacteus Mini-Hemoglobin (pdb code 4f6i). This binding sites where shown with 5.0 Angstroms radius around Iron atom. The 4f6i structure was solved by J.SOMAN, M.D.SALTER, J.S.OLSON, with X-Ray Crystallography technique, brief refinement statistics is given in the table below: